Gate-valve.



A. W. FISCHER.

GATE' VALVE.

APPLICATION FILED MAR.14, 1907.

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r.AIDAL'BERT W. FISCHER, 0F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TOSCHUTTE .AND KOERTING COMPANY, 0F PHILADELIPHIA, PENNSYLVANIA, ACORPORATION OF YENN SYLVAN IA.

GATE-VALVE. l

Speciication of Letters Patent.

)Patented June 1A, 1910.

Application filed March 14, 1907. Serial No. 362,430.

To all whom it may concern.'

Be it known that I, ADALBERT WV. FISCHER,

la subject of the Emperor of Germany, re-

siding in the city and county of Philadelphia, in the State ofPennsylvania, have invented a certain new and useful Improvement inGate-Valves, of which the following is a true and exact description,reference being had to the accompanying draw` ings, which form a partthereof.

\ My present invention relates to gate valves, and has for its object toprovide a valve of this character which is relatively simple inconstruction and reliable in operation and in which the connectionsbetween the vvalves proper and the operating stems are such that thevalves proper or valve disks in opening are moved, first away from theirseats and then transversely thereto, and reversely in closing, and inwhich the parts are so constructed and arranged that the frictionalresistance to the movements and the tendency to injure the weak orrelatively easily injured parts of the valve construction are reduced toa minimum.

|The various features of novelty which characterize my invention arepointed out with particularity in the claims annexed to and forming apart of this specification. For a better understanding of my invention,however, and the advantages possessed by it, reference may be had to theaccompanying vdrawings and descriptive matter in which I haveillustrated and described one of the forms in which my invention may beembodied.

0f the drawings, Figure 1 is a sectional elevation of the valve casingand mechanism taken on the line 1 1 of Fig. 3, showing the valve in theopen position. Fig. 2 is a -section similar to Fig. 1 with the valve inthe closed-position. Fig. 3 is a section on the iine 3,-3 of Fig. 2.Fig. 4 is a section on the line 4 4 of Fig. 2 with the valve head shownin full. Fig. 5 is an elevation of one of the valve disks. And Fig. 6 isa sectional elevation showing a modified form of valve disk and seat.

A indicates the valve casing having oppo- `sitely disposed seats A1, A1,between which is located the valve chamber A2 in which the valve head Band parts connected to it are movable transversely of the valve seats,by means of the stem B1 passing through the removable casing head A andstuffing box A4.

rlfhe stem B1 has a threaded portion B2 which passes through a nut B31journaled in and held a inst endwise movement by the crosshead 5 carriedfrom the casing head A3 by arms A6. hand-wheel B41 in the usual manner.rlhe head B carries a shaft B4 extending transversely to the stem andcarrying at its ends rollers B5, which extend into channels, orguideways, A1, formed by ribs AS, carried by the side walls of thechamber A2 at the sides of the valve seats and extending parallel to thestem B1.

Each of the two valve disks C, or valves proper has formed on its innerside ears C1, in which is journaled a shaft D extending parallel to theshaft B4. Arms or links E each ournaled at one end on the shaft B1 andat the other end on the corresponding shaft D, serve to connect thevalve disks to the head.

The shafts D are slightly shorter than the distance between the rollersB5 so that they clear the latter, but are long enough so that theirvends provide guide contacting surfaces for engaging the ribs A8. Whenthe valve is in the open position, shown in Fig. 1, each valve disk isheld away from its seat by the engagement of the ends of its shaft Dwith the adjacentrib AS. The lower ends of the ribs A8 are arranged,however, sothat .when the valve disks are moved into alinement with thevalve seats the valve disks are allowed to spread apart and seatthemselves. Preferably the corners of the ribs A8 are beveled olf asindicated at A1?. The proper seating is controlled by providing stopshoulders or transverse ribs A9 on the side walls of the chamber A2,beneath the lower ends of the ribs A8. As the valve head is moved downfrom the position shown in Fig. l to the posit-ion shown in Fig. v2 thevalve disks are held from moving apart by The nut B31 is rotated by thethe ribs `A8 until the shafts D pass beneath and final closingmovements, cam lugs C3 are formed on the inner side of each valve disk,and these coperate with corresponding cam lugs lB6 formed on the sidesof the head. This parallel movement of the valve disks is alsofacilitated by locatin the shafts D midway between the top an of thevalve disks, as shown.

Ordinarily in opening or closing a valve lof this character the fluidpressure acts in a mannertending to move one valve disk toward its seatand the other away from seat. With the constructioni described thislateral pressure on the valve disk is, of course, transmitted to theshaft Bpandftends to move the latter transversely 'of the line ofmovement of the valve stem. This tendency is resisted, however, and anyconsequent bending of the valve stem prevented by the engagement withthe ribs A8 of the guide contacting surfaces provided by the guide rollsB5. At the same time the toggle connections between the valve disks andthe valve head and the cam lugs Cl and B6 cause the valve disks to movewithout tipping or sliding on the-valve seats simultaneously into andout of engagement with the latter. With the arran ement disclosed therollers B5 and the en s of the shafts which form in effect anti-frictionrolls insure that the frictional resistance to the operation of thevalves is relatively small and valvesv controllin large pipes orconduits in which the flui Ipressure 1s high may be opened and closedwith comparative ease.

To facilitate grinding ofthe valves and valve seats I preferably makethe shafts D readily removable from the ears C1 so that thegrinding maybe .carriedl out after removal ofthe shafts byrotating the valves ontheir seats.

' Instead of making thevalves and valve seatsso that the surface ofContact between each valvev and its seat is plane, as in theconstruction shown in Figs. 1 to` 5 inclusive, I prefer in many cases tomake-the .seat engaging surface of each valve disk conical, as indicatedat C2 in Fig. v6, the valve engaging surface of the valve seat member A'beingalso conical of course. The use fof the conical valves and seatsis rpossible with the construction disclosed because ofthe provisionmade for moving the valves transversely to their seats in the openingand closing movements in a positive manner and with littlefrictionalretardation. Y

Having now described my invention, what I claim as new and desire tosecure by Letv ters Patent is, ,Y

bottom edges -valves, and guides carried, by the casing forcoeratingwith thel stem carried guides to hol the stem against lateral movementat all times, and with the guides connected to the valves to cause. thevalves to move first transversely to the line of movement of the stemand then parallel thereto in opening and reversely in closing.

2. A gate valve casing having oppositely' disposed seats, guides forholding the valves in retracted position Twhile moving toward and awayfrom their operative positions, and for preventing lateral movement ofthe valve stem, and guides vfor directing the valves toward said seatsin combination with a valve stem, arms pivotally secured to, said stemand extending on each side thereof, valves pivotally secured to saidarms, said valves having guide contacting surfaces arrangedto engage theguides in the casing and guide the valves in their determined paths, andvsaid stem having guide contactf ing surfaces concentric with thepivotal connection between the stem and arms, also engaging the casingguides.

3. In a gate valve, a casing, a valve stem lextending into said casingand movable in the direction of its length, said 'casing havingoppositely dispose each side' of the line of movement of the stem, ahead carried by the stem, guide rolls journaled on said head to turnrelatively thereto about an axis transverse to the line of movement ofthe st`em guide ribs engaging said rolls and carrie by the casing one ateach side of each guide roll, two sets of arms pivoted to the head, oneset extending toward one valve seat and the other toward the other valveseat, valves for the valve seats, one pivoted to each set of arms,guides connected to said valves and engaging the inner sides of saidguide ribs when the valves are in the o en position, said guide ribsbeing arrange so that thelast mentioned guides clear the sides of theribs when the valves are closely adjacent their seats, other guide ribscarried by the casing in osition to prevent movement of the gui escarried by the valve in a direction parallel to the movement of the stemwhen the valves valve seats one on` ting a ytransverse movement of saidguides at that time.

' 4. In a gate valve, a casing,. a valve stem ,extending into saidcasing andmovable in the direction of its length, said casing havy ingoppositely disposed valve seats one on Y each side of the line ofmovement of the stem, a shaft pivotally supported by said stem withinsai casing and extending trans- `shaft-'with the stem supported shaft, apair of guide ribs at each side of the valve seats extending parallel tothe stem and located one on each side of the corresponding roll, saidvalve shafts being extended to engage said guide ribs, the latterterminating immediately above the positions of the valve carried shaftswhen the valves are closely adjacent their seats and being'separated bya distance less than the distance between the outer sides of the valvecarried shafts when the ,valves are against their seats and transverseguides carried by the casing against -which the underside of the valveshafts eneach side of the line of movement of the valve stem and beingprovided at the sides v of the valve seats with guideways extendingtransversely to the stem, and with guideways extending parallel to thestem and communicating with the first mentioned guideways, a valve foreach valve seat, connections between each valve and the stem,

guides carried by the stem adjacent the valve connections, said guidesworking in the guideway extending parallel to the stem, and guidesconnected with the valves, the4 last mentioned guides entering saidlateral guideways when the valves are near the closing position wherebythe initial opening and final closing movements of theI valves aretransverse to the line of movement to the stem, the last mentionedguides also entering said longitudinal guideways as the valves movefarther away from their sea-ts whereby further movement of the valves isina direction parallel to the movement of the stem.

6. In a gate valve, a casing, a valve stem extending into said casingand movable in the direction of its length, said casing lhavingoppositely disposed conical valve seats one on each side of the line ofmovement of the stem, a valve for each seat, having a conical seatengaging portion, one or more links' connecting each valve to the stem,guides carried by the stem adjacent its connection to said links, guidesconnected to the valves, vand guides carried by the casing forcoperating with the stem carried guides to hold the stem against lateraly movement at all times, and with the guides connected to the valves tocause the valves to move first transversely to the line of movement ofthe stem and then parallel thereto in opening and reversely in closing.

7. In a gate valve, a casing, a valve stem extending into said casingand movable in the direction of its length, said casing havingoppositely disposed circular valve seats one on each side of the line ofmovement of the stem, a valve for each seat having a circular seatengaging face and apertured ears C1 on its back, a shaft passing throughand readily removable from the ears at the back of each valve, eachshaft having its ends projecting beyond the valve to form casingengaging guides, one or more links each pivotally connected at one endof one or the other of said shafts and at the other end to said stem,and guides carried bythe stem adjacent its connection to said links, andguides carried by the casing for cooperating with the stem carriedguides to holdr the .stem against lateral movement at all times,-

and with the guides formed by the ends of the shafts passing through thevalve ears f ADALBERT W. FISCHER.

Witnesses ARNOLD KATZ, ERNEST H. Hos.

